Rey Mysterio

Here is a couple of possibilites:1: A glitch2: Did you delete a friend of your friends lidt? If so, this is the case.3: When you went to the book icon, you may have clicked history instead of parent.~R-M~

~Girl~

Ok if you go to the parents list press the B button to see its age and stuff.
but after you have entered the parent code in tamagotchi town and got the password for the mobile, it won't come up anymore

Lil'Tama

It could be a glitch, it depends. If you've stuffed around with your Friends list, you could have glitched it. It happens like that. But yeah, you should be able to get a password for TamaTown, and you can visit your parent in TamaTown; and if you go another generation, you can visit them again in TamaTown in grandparent.